SECO

What SECO does

SECO GmbH is a privately held German manufacturer of precision spare parts for large-bore power plant and marine diesel engines, headquartered in Quedlinburg, Germany. The company's product portfolio centers on pistons up to 500mm diameter, cylinder liners, connecting rods, valve seat rings, O-rings, piston rings, and fuel injection equipment. Its flagship offering is the WearResist® line of wear-resistant piston crowns, which the company reports demonstrate substantially longer service life than competing products — specifically, 0.085mm of wear after 15,000 operating hours versus 0.515mm for competitors, with a documented 83% reduction in first-ring-groove wear. SECO holds OEM supplier approval from engine manufacturers including MAN B&W, Himsen, MaK, and Wärtsilä, established in 1990 following German reunification.

SECO operates a direct enterprise sales model with quote-based pricing, targeting two primary segments: power plant operators maintaining diesel generator sets and marine vessel operators servicing large-bore propulsion engines. The company also offers condition monitoring and engine overhaul services, including on-site expert deployment for cylinder head, cylinder liner, connecting rod, and injection pump work. Distribution for MAN B&W and Himsen products runs through SECO's own direct sales channel; MaK, Caterpillar, and Wärtsilä products are distributed exclusively through sister company Marine Motor Service GmbH (MMS). The company's marketing footprint consists of a multilingual corporate website (German, English, Spanish), a LinkedIn company page, and a YouTube channel — no public pricing, no disclosed financials, and no external funding or institutional ownership are recorded.

Name

SECO

Legal name

Ersatzteile für Kraftwerks- und Marine-Dieselmotoren SECO GmbH

Website

https://www.diesel-engine-motor-service.com

Company type

Private

Founded year

1873

Operating status

Operating

Headcount range

51–100 employees

Short description

SECO GmbH is a private German manufacturer of precision spare parts — pistons, cylinder liners, connecting rods, and valve seat rings — for large-bore power plant and marine diesel engines, selling directly to utilities, vessel operators, and OEMs.

Ownership category

akta.pro rank

Product category

Diesel Engine Components

NAICS

Fluid Power Cylinder and Actuator Manufacturing (333995), Fluid Power Pump and Motor Manufacturing (333996), Measuring, Dispensing, and Other Pumping Equipment Manufacturing (333914)

SIC

Engines & Turbines (3510), Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050)

akta.pro industry

PRIMARYIMAJAHAA

Marine Diesel & Dual-Fuel Engines

Industrials, Manufacturing & Construction/Marine & Shipbuilding/Marine Propulsion & Power Systems (Engines, Drives, Thrusters)

SECONDARYIMAHAGAI

Seals, Gaskets & Fluid Connectors (O-rings, packings, rotary seals, quick couplers)

Industrials, Manufacturing & Construction/Industrial Machinery & Heavy Equipment/Fluid Power & Motion Control Equipment

SECONDARYEDAOAEAE

Diesel Engine Service & Repair

Education/Vocational, Technical & Trade Education/Automotive, Diesel & Heavy Equipment Trades

SECONDARYIMAJAHAK

Fuel & Emissions Systems for Propulsion (Fuel supply, SCR, EGR, exhaust aftertreatment)

Industrials, Manufacturing & Construction/Marine & Shipbuilding/Marine Propulsion & Power Systems (Engines, Drives, Thrusters)

Keywords

• Diesel engine spare parts
• Marine engine components
• Power plant pistons
• Engine cylinder liners
• Diesel engine OEM parts

Headquarters

HQ city

Quedlinburg

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. Spare Parts Sales: One-time sales of replacement components including pistons, piston crowns, cylinder liners, connecting rods, valve seat rings, O-rings, seals, piston rings, injection equipment, valves, rotary devices, pump elements, injection nozzles, and filters for large diesel engines.
2. Engine Overhaul Services: Provides complete engine component overhaul services including cylinder head refurbishment, cylinder liner reconditioning, connecting rod overhaul, and injection pump servicing. Performed by qualified and experienced personnel deployed to customer sites.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

SECO manufactures and supplies spare parts for large bore diesel engines used in power plants and marine vessels, including pistons, cylinder liners, connecting rods, valve seat rings, piston rings, seals, and injection equipment. The company offers its proprietary WearResist® piston crown technology and provides condition monitoring and engine overhaul services for MAN B&W, Himsen, MaK, and Wärtsilä diesel engines.

Product overview

SECO GmbH is a manufacturer of spare parts for power plant and marine diesel engines with more than 50 years of experience. The company's product portfolio centers on engine components including Kolben (pistons), Zylinderlaufbuchsen (cylinder liners), Ventilsitzringe (valve seat rings), Pleuelstangen (connecting rods), O-Ringe und Dichtungen (seals), Kolbenringe (piston rings), and Einspritzequipment (injection equipment). The flagship product line is the WearResist® piston crown series known for extended service life. SECO serves as an OEM supplier to various engine manufacturers and their licensees, supplying compatible parts for engines from MAN B&W, Himsen, MaK, Wärtsilä, and other major manufacturers. The company also offers technical support services including condition monitoring and engine overhaul services for cylinder heads, cylinder liners, connecting rods, and injection pumps.

Differentiator

Problem solved

Functional benefit

Brands

• WearResist: Premium quality piston crowns with extended wear resistance for marine and power plant diesel engines.

Products and services

• Pistons (Kolben) Pistons for power plant and marine diesel engines, manufactured to diameters up to 500mm with over 50 years of experience, including WearResist® quality piston crowns with extended service life.
• Cylinder Liners (Zylinderlaufbuchsen) Cylinder liners for diesel engines, added to the product portfolio as part of portfolio expansion.
• Valve Seat Rings (Ventilsitzringe) Valve seat rings for diesel engine valves, part of the expanded product portfolio.
• Connecting Rods (Pleuelstangen) Connecting rods for diesel engines, added to the product portfolio as part of portfolio expansion.
• O-Rings and Seals (O-Ringe und Dichtungen) O-rings and sealing components for diesel engines.
• Piston Rings (Kolbenringe) Piston rings for diesel engines.
• Injection Equipment (Einspritzequipment) Fuel injection equipment including injection pumps, injection nozzles, and related components for diesel engines.
• Condition Monitoring Service Technical support service for condition monitoring of power plant and marine diesel engines, including expert support during engine overhauls and fuel/lubricant consumption optimization.
• Engine Overhaul Services Overhaul services for cylinder heads, cylinder liners, connecting rods, and injection pumps for MAN and Himsen engines, performed by qualified personnel deployed to customer sites.

Quantifiable outcome

• WearResist® piston crowns show only 0.085mm wear after 15,000 operating hours versus 0.515mm for competitor products (83% reduction in wear rate)
• +2 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

One partnership is on record.

• Marine Motor Service GmbHcoreChannel Partner/ Reseller/ DistributorMarine Motor Service GmbH (MMS) is SECO's sister company and exclusive distribution partner for MaK, Caterpillar, and Wärtsilä engine products. The two companies also jointly produce and supply WearResist® quality piston crowns for MaK and Wärtsilä engines. MMS handles the complete distribution and service channel for these specific engine brands while SECO focuses on MAN B&W and Himsen products.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Marine Motor Service GmbH: Sister company of SECO that co-produces WearResist® piston crowns and exclusively distributes SECO parts for MaK, Caterpillar, and Wärtsilä engines. Operates in the identical niche of spare parts and overhaul services for large-bore marine and power-plant diesel engines, making it the closest direct comparison.
• Miba AG: Austrian manufacturer of engine bearings, pistons, and powertrain coatings for industrial and heavy-duty diesel applications. Closely comparable to SECO in proprietary surface/coating technology and focus on heavy-duty diesel and stationary engine components.

Broad incumbents

• MAHLE GmbH: Global German manufacturer of pistons, cylinder liners, and other engine components for automotive and large-engine applications. Comparable to SECO in piston and cylinder-liner manufacturing know-how, but serves a much broader portfolio of OEMs and engine sizes including passenger-car and commercial-vehicle diesel.
• KS Kolbenschmidt Pierburg (Rheinmetall): German piston and engine-component specialist within Rheinmetall's industrial portfolio. Directly comparable to SECO in pistons and large-engine wear-parts manufacturing, though it serves a much broader customer base across passenger car, commercial vehicle, and industrial diesel applications.
• ElringKlinger AG: German manufacturer of gaskets, sealing technology, and engine/powertrain components. Comparable to SECO in precision engine seals and metal-based components supplied to large-engine OEMs, though ElringKlinger serves a much broader set of end markets including automotive and fuel cell.
• Federal-Mogul (Tenneco / Dana Incorporated): Global Tier-1 supplier of engine bearings, pistons, rings, seals, and gaskets for automotive and industrial engines. Comparable to SECO across multiple product lines (pistons, rings, seals) for diesel engines, but operates at vastly greater scale across commercial-vehicle and industrial markets.
• Wärtsilä: Finnish marine and energy engine OEM and service provider. Comparable as both a source of SECO's compatible-parts business and as a competing supplier of genuine spare parts, overhaul services, and condition monitoring for the same marine and power-plant engine installed base.
• MAN Energy Solutions: German marine and power-plant engine OEM (MAN B&W). Comparable as SECO's largest named compatible-parts target and as a competitor offering genuine OEM parts, licensed aftermarket, and service agreements for the same large-bore diesel installed base.
• Robert Bosch GmbH: Global supplier of fuel injection systems, including injection pumps and nozzles for large diesel engines. Directly comparable to SECO's injection-equipment product line at the component level, though Bosch operates across all diesel power ranges and has its own OEM relationships.
• Caterpillar Marine / Caterpillar Inc. US-based engine OEM with significant marine (MaK) and power-generation diesel offerings. Comparable as one of SECO's four named compatible-parts engine platforms and as a competing supplier of genuine spare parts and overhaul services through its global dealer network.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCRzQc1DZxIrqlofhdvxVhaQ
• LinkedInlinkedin.com/company/seco-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SECO